CN102730891A - System for cyclically utilizing nitric acid in wet process of surface treatment - Google Patents
System for cyclically utilizing nitric acid in wet process of surface treatment Download PDFInfo
- Publication number
- CN102730891A CN102730891A CN2012102736241A CN201210273624A CN102730891A CN 102730891 A CN102730891 A CN 102730891A CN 2012102736241 A CN2012102736241 A CN 2012102736241A CN 201210273624 A CN201210273624 A CN 201210273624A CN 102730891 A CN102730891 A CN 102730891A
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- China
- Prior art keywords
- nitric acid
- liquid
- wet process
- surface treatment
- distiller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910017604 nitric acid Inorganic materials 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004381 surface treatment Methods 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 47
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000012535 impurity Substances 0.000 claims abstract description 17
- 238000009835 boiling Methods 0.000 claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 9
- 150000002823 nitrates Chemical class 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000001728 nano-filtration Methods 0.000 claims description 16
- 125000004122 cyclic group Chemical group 0.000 claims description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 239000001117 sulphuric acid Substances 0.000 claims description 5
- 235000011149 sulphuric acid Nutrition 0.000 claims description 5
- 239000002033 PVDF binder Substances 0.000 claims description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052779 Neodymium Inorganic materials 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical compound FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 claims description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000001704 evaporation Methods 0.000 claims 1
- 230000008020 evaporation Effects 0.000 claims 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 abstract 1
- 239000002699 waste material Substances 0.000 description 9
- 229910001385 heavy metal Inorganic materials 0.000 description 6
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229960002050 hydrofluoric acid Drugs 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000006210 lotion Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- NHDHVHZZCFYRSB-UHFFFAOYSA-N pyriproxyfen Chemical compound C=1C=CC=NC=1OC(C)COC(C=C1)=CC=C1OC1=CC=CC=C1 NHDHVHZZCFYRSB-UHFFFAOYSA-N 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Separation Using Semi-Permeable Membranes (AREA)
- ing And Chemical Polishing (AREA)
Abstract
The invention provides a system for cyclically utilizing nitric acid in a wet process of surface treatment. The system comprises a collecting and storing groove, a nanometer-level filter, a distiller, a condenser and an electric depositor, and is used for separating the nitric acid, water, sulfuric acid and metal impurities of liquid to be treated in the wet process of the surface treatment, so as to cyclically utilize the nitric acid, wherein the collecting and storing groove is used for collecting the liquid to be treated; the nanometer-level filter separates nitrates or sulfates in the liquid to be treated, so as to form filtered liquid and concentrated liquid; the distiller separates the concentrated liquid into nitric acid mixed vapor and a high-boiling point solution consisting of sulfuric acid and metal impurities; the condenser cools the nitric acid mixed vapor to form a nitric acid solution, and sends the nitric acid solution back to the collecting and storing groove; and the electric depositor reduces the metallic impurities in the high-boiling point solution to be at a metal state by using electric power, separates out the metallic impurities at the metal state, and sends the residual sulfuric acid solution back to the distiller.
Description
Technical field
The present invention be more particularly directed to the cyclic utilization system of nitric acid in a kind of surface treatment wet process, it utilizes nanofilter, distiller and the galvanic deposit device nitric acid to be comprised in the pending liquid of recycle.
Background technology
No matter be liquid crystal panel, semiconductor element (such as unicircuit) or printed substrate (PCB), all need different wet process with the electroplating processes of carrying out specific pattern, deposited plating processing, etch processes or clean.Therefore, wet process can produce the waste liquid that comprises various acid solutions in a large number, uses such as using the mix acid liquor of being made up of acetic acid, nitric acid or fluoric acid to be used as etching solution.Usually, also comprise different heavy metals in the waste liquid, such as copper or nickel, and the heavy metal of this type has potentially dangerous property for environment, therefore, need further dispose waste liquid to reduce or to remove heavy metal, uses the regulation that meets environmental regulation.
In the prior art, most of general wet process dealer is after the waste liquid of all processing procedures is concentrated, and transfers to that the specialized vendor utilizes quite complicated equipment unit and operative technique and on behalf of processing.Yet the shortcoming of prior art is that outer the disposing waste liquid of committee not only increases cost; And the various acid solutions in the waste liquid are recyclable utilizations; Can be used as solvent or lotion usefulness such as nitric acid, and the heavy metal price general charged in the waste liquid is all quite high, not only cause the waste and also can't further reduce cost.
Therefore; The cyclic utilization system that needs nitric acid in a kind of surface treatment wet process utilizes and collects storage tanks, how meter level strainer, distiller, condensing surface and galvanic deposit device form the closed circulation path, use recycle nitric acid; And separate sulfuric acid and heavy metal, to solve prior art problems.
Summary of the invention
The cyclic utilization system of main purpose of the present invention nitric acid in a kind of surface treatment wet process is provided; Comprise and collect storage tanks, nanofiltration device, distiller, condensing surface and galvanic deposit device; Handle nitric acid, water, sulfuric acid and the metallic impurity of pending liquid in the wet process in order to release surface, and then reach the purpose of recycle nitric acid.
Collection storage tanks of the present invention is in order to collecting the pending liquid in the surface treatment wet process, and forms pending storage liquid and export.The nanofiltration utensil has the nanofiltration film, collects the pending storage liquid that storage tanks is exported in order to filter, and form not contain the filtered liq of nitrate salt or vitriol and contain nitrate salt or the liquid concentrator of vitriol, and filtered liq is recycled to the collection storage tanks.
Distiller receives the liquid concentrator that the nanofiltration device is produced, and after being heated to specified temp, making nitric acid and water partly in the liquid concentrator flash to the nitric acid mixed vapour, and stays the high boiling point solution of being made up of the sulfuric acid and the metallic impurity of higher.Condensing surface receives the nitric acid mixed vapour, and makes the cooling of nitric acid mixed vapour and condense into salpeter solution, is recycled to the collection storage tanks simultaneously.
The galvanic deposit device receives the high boiling point solution that distiller produced, and makes high boiling point solution metal impurity be reduced into metallic state and separates out through electric power, and residual sulphuric acid soln is recycled to distiller simultaneously.
Therefore; System of the present invention can form the circulating path of sealing; Can effectively reclaim the nitric acid in the pending liquid, and, all can provide other processing procedures to use with the metal that metallic state is separated out; Especially can be integrated into existing surface treatment wet process equipment easily, so that simple structure, easy to operate and have a waste liquid recycling function of suitable industry applications to be provided.
Description of drawings
Fig. 1 is the synoptic diagram of the cyclic utilization system of nitric acid in the invention surface treatment wet process;
Main nomenclature: 10 collect storage tankss, 20 how meter level strainer, 30 distillers, 40 condensing surfaces, 50 galvanic deposit devices, G nitric acid mixed vapour, the pending liquid of L1, the pending storage liquid of L2, L3 filtered liq, L4 liquid concentrator, L5 high boiling point solution, L6 salpeter solution, L7 sulphuric acid soln.
Embodiment
Below cooperate graphic and component symbol is done more detailed explanation to implementation method formula of the present invention, have the knack of this art and after studying this specification sheets carefully, can implement according to this in order to do making.
Consult Fig. 1; The cyclic utilization system of nitric acid comprises collection storage tanks 10, nanofiltration device 20, distiller 30, condensing surface 40 and galvanic deposit device 50 in the surface treatment wet process of the present invention; Handle nitric acid, water, sulfuric acid and the metallic impurity of pending liquid L1 in the wet process in order to release surface, and then reach the purpose of recycle nitric acid.
Above-mentioned metallic impurity comprise any one in nickel, copper, cobalt and the neodymium at least.
Collect storage tanks 10 and collect pending liquid L1, and form pending storage liquid L2.
Above-mentioned nanofiltration film has a plurality of nano level holes, and the effective pore radius size of this nano level hole is 12 to 25 rice how, but therefore filtering separation nano-grade matter, molecule, particle.In addition, the nanofiltration film can (Polyvinylidene Fluoride PVDF) constitutes by gathering the human relations vinyl fluoride.
Condensing surface 40 receives nitric acid mixed vapour G, and makes nitric acid mixed vapour G cooling and condense into salpeter solution L6, and salpeter solution L6 is recycled to and collects storage tanks 10, such as pump (not shown) capable of using.
In addition, above-mentioned pending liquid also can further comprise Hydrocerol A, and such as in order to the buffer pH value, and this Hydrocerol A is in system of the present invention, to form closed circulation with sulfuric acid.
Characteristics of the present invention are; Utilize to collect storage tanks, how meter level strainer, distiller, condensing surface and plating tank form the circulating path of sealing; Use recycle nitric acid; And separate sulfuric acid and heavy metal, and then realize can not producing extra other mud or waste water simultaneously by recycle nitric acid.Especially, system of the present invention can directly be integrated into the treatment facility in the existing surface treatment wet process, simplifies overall flow, and improves operation efficiency.
It is to be noted; The above person is merely in order to explain preferred embodiment of the present invention; Be not that attempt is done any formal restriction to the present invention according to this; Be with, all have in that identical invention spirit is following do relevant any modification of the present invention or change, all must be included in the category that the invention is intended to protect.
Claims (6)
1. the cyclic utilization system of nitric acid in the surface treatment wet process; Be to handle water, nitric acid, sulfuric acid and the metallic impurity that pending liquid comprised in the wet process in order to release surface; And the recycle of realization nitric acid; It is characterized in that the cyclic utilization system of nitric acid comprises in the described surface treatment wet process:
One collects storage tanks, is used for collecting this pending liquid, and forms pending storage liquid;
One nanofiltration device; It is the pending storage liquid that receives this collection storage tanks through a pump; And this nanofiltration utensil has at least one nanofiltration film; In order to filter this pending storage liquid, form the liquid concentrator that does not contain the filtered liq of nitrate salt and contain nitrate salt, and this filtered liq is recycled to this collection storage tanks;
One distiller is used to receive this liquid concentrator, after being heated to a specified temp, making nitric acid and the evaporation of water partly in this liquid concentrator and forms the nitric acid mixed vapour, and stay the high boiling point solution of being made up of the sulfuric acid and the metallic impurity of higher;
One condensing surface is used to receive the nitric acid mixed vapour, and makes the cooling of this nitric acid mixed vapour and condense into salpeter solution, and salpeter solution is recycled to this collection storage tanks simultaneously; And
One galvanic deposit device is used to receive the high boiling point solution that this distiller produces, and makes this high boiling point solution metal impurity be reduced into metallic state and separates out through electric power, and residual sulphuric acid soln is recycled to this distiller simultaneously.
2. the cyclic utilization system of nitric acid is characterized in that in the surface treatment wet process according to claim 1, and described metallic impurity comprise any one in nickel, copper, cobalt and the neodymium at least.
3. the cyclic utilization system of nitric acid in the surface treatment wet process according to claim 1; It is characterized in that; Described nanofiltration film is by gathering human relations vinyl fluoride (Polyvinylidene Fluoride; PVDF) formation, and this nanofiltration film has a plurality of nano level holes, and the effective pore radius size of nano level hole is 12 to 25 nanometers.
4. the cyclic utilization system of nitric acid is characterized in that in the surface treatment wet process according to claim 1, and the flow proportional of described filtered liq and liquid concentrator is 5:100 to 15:100.
5. the cyclic utilization system of nitric acid is characterized in that in the surface treatment wet process according to claim 1, and the working temperature of described distiller is between 115 ℃ to 125 ℃.
6. the cyclic utilization system of nitric acid is characterized in that in the surface treatment wet process according to claim 1, and described pending liquid further comprises Hydrocerol A, and Hydrocerol A is to circulate with sulphuric acid soln.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102736241A CN102730891A (en) | 2012-08-02 | 2012-08-02 | System for cyclically utilizing nitric acid in wet process of surface treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102736241A CN102730891A (en) | 2012-08-02 | 2012-08-02 | System for cyclically utilizing nitric acid in wet process of surface treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102730891A true CN102730891A (en) | 2012-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102736241A Pending CN102730891A (en) | 2012-08-02 | 2012-08-02 | System for cyclically utilizing nitric acid in wet process of surface treatment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102730891A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103172214A (en) * | 2013-04-09 | 2013-06-26 | 昆山市台鑫五金厂 | Regeneration process and regeneration device for heavy metal containing nitric acid waste liquor |
| CN103213957A (en) * | 2013-03-12 | 2013-07-24 | 华夏新资源有限公司 | Waste acid recovery system |
| CN104512870A (en) * | 2013-10-07 | 2015-04-15 | 东莞市东旺化玻仪器有限公司 | Electroplating hanger hook off heavy metal waste nitric acid recycling device and recycling method |
| TWI504558B (en) * | 2013-02-05 | 2015-10-21 | High efficiency recovery of nitric acid separation equipment and its method | |
| WO2016184248A1 (en) * | 2015-05-21 | 2016-11-24 | 成都虹华环保科技股份有限公司 | Nitric acid stripping liquid treatment system |
| CN107459021A (en) * | 2017-07-25 | 2017-12-12 | 四川思达能环保科技有限公司 | Reduce nitrate the apparatus and method of solution |
| CN118756308A (en) * | 2024-08-16 | 2024-10-11 | 湖南时光钻石科技有限公司 | Acid solution circulation system for pickling electrolytic cell |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU737502A1 (en) * | 1978-01-20 | 1980-06-02 | Украинский Научно-Исследовательский Институт Полиграфической Промышленности | Method of purifying spent pickling solution |
| JPH0270585A (en) * | 1988-09-06 | 1990-03-09 | Matsushita Electric Ind Co Ltd | Battery light for bicycle |
| JPH0970585A (en) * | 1995-08-31 | 1997-03-18 | Samsung Electron Co Ltd | Water purifying plant |
| JP2004275922A (en) * | 2003-03-17 | 2004-10-07 | Kurita Water Ind Ltd | Method and apparatus for treating wastewater containing volatile organic compounds |
| KR100742088B1 (en) * | 2005-11-03 | 2007-07-23 | 재단법인 포항산업과학연구원 | Recycling method of copper nitrate waste generated from etching process with etching liquid and electrolytic copper |
| KR100758877B1 (en) * | 2006-04-26 | 2007-09-14 | 한국지질자원연구원 | Purification method of high purity platinum from platinum scrap |
| CN101353727A (en) * | 2008-09-18 | 2009-01-28 | 西部金属材料股份有限公司 | Method for reclaiming silver and copper in silver-copper alloy scrap |
| CN102079512B (en) * | 2010-11-29 | 2012-07-04 | 重庆大学 | Process for recovering sulfuric acid and sulfate from waste acid generated in preparation of titanium dioxide by using sulfuric acid method |
-
2012
- 2012-08-02 CN CN2012102736241A patent/CN102730891A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU737502A1 (en) * | 1978-01-20 | 1980-06-02 | Украинский Научно-Исследовательский Институт Полиграфической Промышленности | Method of purifying spent pickling solution |
| JPH0270585A (en) * | 1988-09-06 | 1990-03-09 | Matsushita Electric Ind Co Ltd | Battery light for bicycle |
| JPH0970585A (en) * | 1995-08-31 | 1997-03-18 | Samsung Electron Co Ltd | Water purifying plant |
| JP2004275922A (en) * | 2003-03-17 | 2004-10-07 | Kurita Water Ind Ltd | Method and apparatus for treating wastewater containing volatile organic compounds |
| KR100742088B1 (en) * | 2005-11-03 | 2007-07-23 | 재단법인 포항산업과학연구원 | Recycling method of copper nitrate waste generated from etching process with etching liquid and electrolytic copper |
| KR100758877B1 (en) * | 2006-04-26 | 2007-09-14 | 한국지질자원연구원 | Purification method of high purity platinum from platinum scrap |
| CN101353727A (en) * | 2008-09-18 | 2009-01-28 | 西部金属材料股份有限公司 | Method for reclaiming silver and copper in silver-copper alloy scrap |
| CN102079512B (en) * | 2010-11-29 | 2012-07-04 | 重庆大学 | Process for recovering sulfuric acid and sulfate from waste acid generated in preparation of titanium dioxide by using sulfuric acid method |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI504558B (en) * | 2013-02-05 | 2015-10-21 | High efficiency recovery of nitric acid separation equipment and its method | |
| CN103213957A (en) * | 2013-03-12 | 2013-07-24 | 华夏新资源有限公司 | Waste acid recovery system |
| CN103172214A (en) * | 2013-04-09 | 2013-06-26 | 昆山市台鑫五金厂 | Regeneration process and regeneration device for heavy metal containing nitric acid waste liquor |
| CN104512870A (en) * | 2013-10-07 | 2015-04-15 | 东莞市东旺化玻仪器有限公司 | Electroplating hanger hook off heavy metal waste nitric acid recycling device and recycling method |
| CN104512870B (en) * | 2013-10-07 | 2016-08-10 | 东莞市东旺化玻仪器有限公司 | Electroplating hanger heavy metal hooking and removing waste nitric acid recycling device and recycling method |
| WO2016184248A1 (en) * | 2015-05-21 | 2016-11-24 | 成都虹华环保科技股份有限公司 | Nitric acid stripping liquid treatment system |
| CN107459021A (en) * | 2017-07-25 | 2017-12-12 | 四川思达能环保科技有限公司 | Reduce nitrate the apparatus and method of solution |
| CN107459021B (en) * | 2017-07-25 | 2023-11-24 | 四川思达能环保科技有限公司 | Apparatus and method for decomposing nitrate solution |
| CN118756308A (en) * | 2024-08-16 | 2024-10-11 | 湖南时光钻石科技有限公司 | Acid solution circulation system for pickling electrolytic cell |
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Application publication date: 20121017 |